继承时报错了

小甲鱼的铁粉

Student是基类，Menu类要继承Student

这个是Student.java文件的代码

package essential;
public class Student {
        
        public String studentNumber;
        public String name;
        public String major;
        
        public int math;
        public int computer;
        public int english;
        public int sum;
        
        public Student (String _studentNumber, String _name, String _major, int _math, int _computer, int _english){
                studentNumber = _studentNumber;
                name = _name;
                major = _major;
                
                math = _math;
                computer = _computer;
                english = _english;
        }
}

这个是Menu.java文件的代码，红色的是报错的部分，public class Menu extends Student报错为：没有为缺省构造函数定义隐式超构造函数 Student（）。必须定义显式构造函数

package essential;
import java.util.Scanner;
public class Menu extends Student{

        public static void main(String[] args) {
                Scanner in = new Scanner(System.in);
                Student []stu = new Student[5];
                
                stu[0] = new Student("Jack","软工","20183101",80,90,85);
                stu[1] = new Student("Rose","大数据","20183102",99,93,90);
                stu[2] = new Student("John","网安全","20183103",87,70,74);
                stu[3] = new Student("Andi","网工程","20183104",67,66,68);
                stu[4] = new Student("Mike","物联网","20183105",56,90,55);
                
        }
}

这个该怎么解决呢

小甲鱼的铁粉

如果加上构造函数，改为这样，就找不到Student了

package essential;
import java.util.Scanner;
public class Menu extends Student {

        public Menu(String _studentNumber, String _name, String _major, int _math, int _computer, int _english) {
                super(_studentNumber, _name, _major, _math, _computer, _english);
                // TODO 自动生成的构造函数存根
        }

        public static void main(String[] args) {
                Scanner in = new Scanner(System.in);
                Student []stu = new Student[5];
                
                stu[0] = new Student("Jack","软工","20183101",80,90,85);
                stu[1] = new Student("Rose","大数据","20183102",99,93,90);
                stu[2] = new Student("John","网安全","20183103",87,70,74);
                stu[3] = new Student("Andi","网工程","20183104",67,66,68);
                stu[4] = new Student("Mike","物联网","20183105",56,90,55);
                
        }
}

报错为public class Menu extends Student {
                          ^
  符号: 类 Student
Menu.java:12: 错误: 找不到符号
                Student []stu = new Student[5];
                ^
  符号:   类 Student
  位置: 类 Menu
Menu.java:12: 错误: 找不到符号
                Student []stu = new Student[5];

baige

Menu类写个构造函数，用super(Student构造函数需要的参数)调用student类的构造函数

小甲鱼的铁粉

baige 发表于 2020-12-22 14:50
Menu类写个构造函数，用super(Student构造函数需要的参数)调用student类的构造函数

不好意思，之前忘记修改帖子了，是环境变量的问题，已经解决了